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The 4th Joint Meeting of the International Conference on hyperfine Interactions and the International Symposium on Nuclear Quadrupole Interactions(hFI/NQI 2012)

作者： K.Bharuth-Ram h.Masenda D.Naidoo R.Mantovan T.E.Mφlholt S.Geburt h.p.gunnlaugsson G.Langouche K.Johnston h.p.Gislason S.Olafsson C.Ronning M.B.Madsen G.Weyer School of physics University of KwaZulu-NatalDurban 4000South Africa School of physics University of the WitwatersrandSouth Africa

The observation of magnetic behaviour in ZnO implanted with non-metallic ions has led to the development of a theoretical model to explain defect induced magnetism[1],and excited much interest in the role of defects in tailoring the physical properties of ZnO[2]. Ferromagnetic behaviour was observed at room temperature in ZnO after implantation with

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Self-assembled bright luminescent hierarchical materials from a tripodal benzoate antenna and heptadentate Eu(III) and Tb(III) cyclen complexes

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 171-184页

作者： Aramballi J.Savyasachi David F.Caffrey Kevin Byrne Gerard Tobin Bruno D'Agostino Wolfgang Schmitt Thorfinnur gunnlaugsson School of Chemistry and Trinity Biomedical Sciences Institute (TBSI) University of Dublin Trinity College Dublin Dublin 2 Ireland School of Chemistry and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) University of Dublin Trinity College Dublin Dublin 2 Ireland

The europium heptadentate coordinatively unsaturated (Eu(III)) and the terbium (Tb(III)) 1,4,7,10-tetraazacyclododecane (cyclen) complexes 1 and 2 were used in conjunction with ligand 3 (1,3,5-benzene-trisethynylbenzoate) to form the supramolecular self-assembly structures 4 and 5;this being investigated in both the solid and the solution state. The resulting self-assemblies gave rise to metal centered emission (both in the solid and solution) upon excitation of 3, confirming its role as a sensitizing antenna. Drop-cased examples of ligand 3, and the solid forms of 4 and 5, formed from both organic and mixture of organic-aqueous solutions, were analyzed using Scanning Electron Microscopy, which showed significant changes in morphology;the ligand giving rise to one dimensional structures, while both 4 and 5 formed amorphous materials that were highly dense solid networks containing nanoporous features. The surface area (216 and 119 m2·g^-1 for 4 and 5 respectively) and the ability of these porous materials to capture and store gases such as N2 investigated at 77 K. The self-assembly formation was also investigated in diluted solution by monitoring the various photophysical properties of 3–5. This demonstrated that the most stable structures were that consisting of a single antennae 3 and three complexes of 1 or 2 (e.g., 4 and 5) in solution. By monitoring the excited state lifetimes of the Eu(III) and Tb(III) ions in h2O and D2O respectively, we showed that their hydration states (the q-value) changed from -2 to 0, upon formation of the assemblies, indicating that the three benzoates of 3 coordinated directly to the each of the three lanthanide centers. Finally we demonstrate that this hierarchically porous materials can be used for the sensing of organic solvents as the emission is highly depended on the solvent environment;the lanthanide emission being quenched in the presence of acetonitrile and ThF, but greatly enhanced in the presence of methanol.

关键词： self-assembly supramolecular chemistry lanthanides Eu(III) and Tb(III) complexes luminescence metallostars

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胸椎断层融合成像在老年人椎体骨折中的附加诊断价值

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国际医学放射学杂志 2017年第2期 236-236页

作者： M.Geijer E.gunnlaugsson S.Gtestrand L.Weber h.Geijer 孙海涛 Department of Radiology rebro University

摘要目的胸椎X线摄影的难度随年龄增加而增大,断层融合是一种有助于胸椎评估的低剂量体层摄影技术,本研究旨在评价断层融合成像对老年胸椎诊断的附加价值。方法

关键词：胸椎融合影像融合成像断层地质构造老年人

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